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Titolo:
Effects of dietary levels of forage and ruminally undegraded protein on early lactation milk yield by Alpine does and doelings
Autore:
Goetsch, AL; Puchala, R; Lachica, M; Sahlu, T; Dawson, LJ;
Indirizzi:
Langston Univ, E Kika de la Garza Inst Goat Res, Langston, OK 73050 USA Langston Univ Langston OK USA 73050 Inst Goat Res, Langston, OK 73050 USA
Titolo Testata:
JOURNAL OF APPLIED ANIMAL RESEARCH
fascicolo: 1, volume: 18, anno: 2000,
pagine: 49 - 60
SICI:
0971-2119(200009)18:1<49:EODLOF>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
FEED-INTAKE REGULATION; DAIRY GOATS; AD-LIBITUM; ENERGY;
Keywords:
goat; lactation; forage; protein;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Goetsch, AL Langston Univ, E Kika de la Garza Inst Goat Res, POB 730, Langston, OK 73050 USA Langston Univ POB 730 Langston OK USA 73050 ston, OK 73050 USA
Citazione:
A.L. Goetsch et al., "Effects of dietary levels of forage and ruminally undegraded protein on early lactation milk yield by Alpine does and doelings", J APPL AN R, 18(1), 2000, pp. 49-60

Abstract

Thirty-one Alpine does and 31 doelings (52 +/- 1.62 and 34 +/- 0.86 kg initial body weight, respectively) were used to determine effects of dietary levels of forage and ruminally undegraded protein (RUP) and change in foragelevel on early lactation performance. Goats began a 8-week covariate period at 3-9 days after parturition, then were assigned to treatments: 80 = 80%forage diet; 80R = 80 with added RUP; 40 = 40% forage diet; 40R = 40 with RUP added; 40-80 = 80 in weeks 1-3, transition to 40 in weeks 4-5 and 40 inweeks 6-16; and 80R-40R = 80R in weeks 1-3 transition. to 40R in weeks 4-5and 40R in weeks 6-16. Diets were 18-19% crude protein (dry matter basis);for 80R and 40R, equal crude protein was supplied by blood, fish and feather meals, substituting for approximately two-thirds of soybean meal protein. Milk yield was greater (P < 0.05) for 40 and 40R than for 80 and 80R, andwas influenced (P < 0.05) by RUP in weeks 1-3 and 4-5 (weeks 1-3: 2.51, 2.74 2.72, 3.33 2.44 and 2.54 mu g/day; weeks 4-5: 2.52, 2.73, 3.13, 3.59, 2.56 and 2.63 kg/day weeks 6-16: 2.18, 2.33, 2.85, 3.11, 2.54 and 3.01 kg/dayfor 80, 80R, 40, 40R, 80-40 and 80R-40R, respectively). Milk protein concentration was greater (P < 0.05) for 40 and 40R than for 80 and 80R (e.g., week 5: 2.81, 2.72, 2.91, 2.86, 2.76 and 2.94% for 80, 80R, 40, 40R, 80-40 and 80R-40R, respectively). In conclusion, milk yield in a 16-week early lactation period was greater with 40 us 80% forage, although RUP impacted milkyield only early in the experiment. Changing dietary forage level in earlylactation of dairy goats did not influence subsequent production.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 08:02:08